Discharge tip for fuel injection nozzle

ABSTRACT

A discharge tip for a fuel injection nozzle comprises a hollow body having a bore closed at one end and open at the other with the closed end being of reduced size relative to the open end and terminating in a partispherical tip exceeding a hemisphere connected with the remainder of the body by an annular necked down surface portion coaxial with the bore and intermediate the ends thereof and having a plurality of radially directed discharge passages in the partispherical portion of the tip with at least one of the orifices disposed in the portion of the partispherical tip outside the hemispherical portion which is concentric with the axis of the elongated bore.

United States Patent [72] Inventor Vernon D. Roosa West Hartford, Conn. [21] Appl. No. 865,828 [22] Filed Oct. 13,1969

Division of Ser. No. 703.488, Oct. 5. 1967. abandoned. Division of Ser. No. 455.913. May 14. 1965. Pat. No. 3.350.963 [45] Patented July 6, 1971 [54] DISCHARGE TIP FOR FUEL INJECTION NOZZL 2 Claims, No Drawings [52] U.S.Cl 239/601, 239/533 [51] 1nt.Cl .I' B05b 1/30 [50] Field of Search 239/533, 86-96, 601

[56] References Cited UNITED STATES PATENTS 2,647,014 7/1953 Edwards 239/601 X FOREIGN PATENTS 8,714 4/1913 Great Britain i.

Primary Examiner-Lloyd L. King Assistant Examiner.lohn J. Love Attorney-Prutzman, Hayes, Kalb and Chilton ABSTRACT: A discharge tip for a fuel injection nozzle comprises a hollow body having a bore closed at one end and open at the other with the closed end being of reduced size relative to the open end and terminating in a partispherical tip exceeding a hemisphere connected with the remainder of the body by an annular necked down surface portion coaxial with the bore and intermediate the ends thereof and having a plurality of radially directed discharge passages in the partispherical portion of the tip with at least one of the orifices disposed in the portion of the partispherical tip outside the hemispherical portion which is concentric with the axis of the elongated bore.

DISCHARGE TIP FOR FUEL INJECTION NOZZLE This application is a division of Applicant's copending application Ser. No. 703,488 now abandoned, filed Oct. 5, 1967 and entitled Discharge Tip for Fuel Injection Nozzle" which in turn is a division of application Ser. No. 455,9l3 filed May 14, 1965 and entitled Nozzle Drilling Machine" which is now US. Pat. No. 3,350,963 issued Nov. 7, 1967.

This invention generally relates to fuel injection nozzle and more particularly concerns the discharge tip of a fuel injection noule.

A further object of the present invention is the provision of an improved discharge tip to incorporate discharge orifices in a variety of arrangements to provide preselected spray patterns. lncluded in this object is the aim of providing a discharge tip having discharge orifices disposed at an angle greater than 90 from the outermost point on the tip.

Other objects will be in part obvious and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of con- ,struction, combination ofelements and arrangement of parts which will be exemplified in the construction hereafter set forth.

In the drawings:

FIG. 1 is a side view, partly broken away and partly in section, of a fuel injection nozzle embodying this invention installed in an engine.

Referring now to the drawing in detail, a fuel injection nozzle is illustrated in FIG. 1 as being installed in the head of a diesel engine 12 to discharge fuel into a combustion chamber of the engine.

The manner and uniformity with which the fuel is mixed with the air in the combustion chamber is important in the efficiency of the combustion of the fuel. In most engines it is necessary to install the fuel injection nozzle with the axis thereof at an angle with the longitudinal centerline of the combustion chamber. Thus, it is important to provide a fuel injection nozzle in which the tip has discharge orifices arranged asymmetrically relative to the longitudinal axis of the nozzle to spray the fuel into the combustion chamber for optimum mixture with the air.

In accordance with one aspect of the present invention a discharge tip 14 is provided with a plurality of discharge ori fices such as at 16 formed so that the axis 18 of the spray pattern may be offset at a preselected angle B from the longitudinal axis of the nozzle to thereby to depress the spray angle A" relative to the axis of the nozzle to assure a good fuel and air mixture in the engine combustion chamber. The discharge tip has an elongated bore 20 open at one end and closed at the opposite end. The open end of the discharge tip communicates with the nozzle body 10 with its bore 20 coaxially aligned withthe longitudinal axis of the body 10. The outer surface of the discharge tip is partispherical in shape and has a longitudinal cross section greater than that of a semicircle to provide a necked down portion 22 between the opposite ends of the nose blank.

Such an arrangement is one in which discharge orifices of the same size may be disposed for various angles of spray and depression for engines of different design, the partispherical discharge tip being particularly suited for easy and accurate drilling. This is true even though the discharge orifices are to be located at an angle of more than with the axis of the nozzle 10. For example, the spray angle A (shown in FIG. 1 as being approximately is symmetrical relative to the spray axis 18 which is illustrated as being offset from the longitudinal axis of the nozzle body 10 at a depression angle "8 of say, 23 requiring one of the discharge orifices 16a to be disposed at an angle of approximately 103 relative to the longitudinal axis of the nozzle body 10. Because of the annular lar to a tangential plane at the point of its en a ement with the nose blank from WhlCh the tip is made. The I! I bit thus in effect engages a substantially fiat drilling surface and is essentially free from lateral drift even though the drill bit may be, say 0.006 inches in diameter. it will therefore be readily apparent that the use of a necked down partispherical tip provides a construction which can readily provide a plurality of discharge orifices having any desired spray pattern.

As will be apparent to persons skilled in the art, various modifications and adaptations of the structure above described will become readily apparent without departure from the spirit and scope of the invention.

iclaim:

l. A discharge tip for a fuel injection nozzle comprising a hollow body, the body having an elongated bore closed at one end of the body, the closed end of the body being of reduced size relative to the opposite end of the body and having a partispherical tip exceeding a hemisphere having a plurality of radial discharge orifices drilled therein, said orifices being symmetrically disposed on a'circle about said tip to provide a uniform discharge of fuel into an associated combustion chamber, said circle having an axis which is asymmetrically disposed relative to the longitudinal axis of said nozzle, at least one of said orifices being positioned in the portion of the partispherical tip outside the hemispherical portion concentric with the axis of the elongated bore.

2. The discharge tip of claim 1 wherein the closed end of the body includes an annular necked down surface portion extending in coaxial alignment with the bore intermediate the ends thereof.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 591 092 Dated July 6 1971 Inventor-(s) Vernon ROOsa It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Figure 1 should appear as shown below:

F/GJ

Signed and sealed this 30th day of May 1972.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents FORM PO-\O50 (10-69) USCOMM-DC 60376-969 UVS. GOVERNMENT PRINTING OFFICE: I969 0-355-334 

1. A discharge tip for a fuel injection nozzle comprising a hollow body, the body having an elongated bore closed at one end of the body, the closed end of the body being of reduced size relative to the opposite end of the body and having a partispherical tip exceeding a hemisphere having a plurality of radial discharge orifices drilled therein, said orifices being symmetrically disposed on a circle about said tip to provide a uniform discharge of fuel into an associated combustion chamber, said circle having an axis which is asymmetrically disposed relative to the longitudinal axis of said nozzle, at least one of said orifices being positioned in the portion of the partispherical tip outside the hemispherical portion concentric with the axis of the elongated bore.
 2. The discharge tip of claim 1 wherein the closed end of the body includes an annular necked down surface portion extending in coaxial alignment with the bore intermediate the ends thereof. 